The picture that is plastered all over the side of the RV of Irv, the salesman, is actually a picture of the director, Barry Sonnenfeld. See more...
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Factual error: When the family is beginning their trip, Bob has difficulty putting the RV in gear. We hear gears grinding despite the fact that the vehicle obviously has an automatic transmission (as evidenced by the column shifter). Automatic transmissions do not contain the same type of gearbox as manual transmissions, and it is impossible for an automatic to create a gear-grinding noise.
Revealing: When Bob is on the bus' roof there are interior shots of the bus and all its right side (viewer's left) sliding metal framed windows are visible and intact. After Travis stops short, in the following exterior shots four of the double sliding windows have been deliberately removed from their tracks, so the camera's view of the kids is unobstructed.
Revealing: When Bob has difficulty with his seat belt at the start of the road trip, the side-view mirrors have a translucent finish, just as in other shots throughout the film; however, the mirrors' surfaces are normal in the rest of the shots. Deliberately done to obscure the reflection of the crew.
Continuity: After the Big Rolling Turd has rolled backwards over the grocery carts, in the shot of the RV heading down the highway the back center window curtain is hardly open. In the following interior shots, as they sing, the entire curtain is open, but in the last exterior shot it is hardly open again.
Revealing: The Munro's RV has a large pop-out (slide-out) on its left side, behind the driver. When the pop-out is closed one side wall should be directly behind the driver's seat, but that wall is gone - it has been deliberately removed. As a side note, when the Munros rush to leave before Mary Jo Gornicke reaches them, that wall (with a small window) is seen in the exterior shot, as it slides in.